CAMBRIDGE Qt 300 Installation guide

Brand: CAMBRIDGE

Model: Qt 300

Type: Installation guide

This manual is also suitable for

Qt 600

Qt® 300/600

Installation and Operations Guide

Table of Contents

Safety Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7

Qt 300/600 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8

Sound Masking Emitter Types . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8

Hardware Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Installing the Control Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Wall Mount . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Rack Mount . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10

Installing the Qt Emitters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

Standard Emitter Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11

Active Emitter Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 12

Table 1 . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Installing Paging or Music to the Audio Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Installing Contact Closures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13

Custom Cabling Guidelines . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Important Considerations . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

Battery Replacement . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14

System Conguration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15

System Congurable Feature List (Front Panel / MCS) . . . . . . . . . . . . . . . . . . . . . . . . . . 15

Conguring the Control Module for the Network . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Front Panel Control . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

System Information. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 16

Setting Sound Masking Levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17

Setting Audio Input Levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 18

Lock/Unlock the Front Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Congure Network Name and IP Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Real-Time Clock or Network Clock. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 19

Reset System to Default Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 20

System Control Using Monitor Control Software (MCS) . . . . . . . . . . . . . . . . . . . . . . . . . . 20

DHCP Support . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

MCS: Operation Screen . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 21

Setting Emitter Type and Masking Spectrum per Zone . . . . . . . . . . . . . . . . . . . . . . . . . . 22

Changing Masking Level Using MCS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Auto Ramping . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23

Changing Inputs A and B Min/Max Levels . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Auxiliary Line Level Adjustment . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24

Time of Day Masking and Audio . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 25

Errors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26

MCS: Administration Section . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Service . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Zone Names . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27

Networking and Security . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Notication of Errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Date and Time – Time Zone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 28

Setting Equalizers and Emitter Fault Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Equalizer Update. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 29

Emitter Network Fault Detection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30

MCS: Help . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31

Links to Help Topics . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Operations and Administration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Software Update . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

MCS: Printout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32

Error Codes and Clear Error . . . . . . . . . . . . . . . . . . . . . . . . . . . 33

Post-Installation Hando . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 34

Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35

Safety Information

1. Read these instructions.

2. Keep these instructions.

3. Heed all warnings.

4. Follow all instructions.

5. Do not use this apparatus near water. Indoor use only.

6. Clean only with dry cloth.

7. Do not block any ventilation openings. Install in accordance with the manufacturer’s instructions.

8. Do not install near any heat sources such as radiators, heat registers, stoves, or other apparatus (including

ampliers) that produce heat.

9. Use only power supply provided with the unit.

10. Do not defeat the safety purpose of the polarized or grounding-type plug. A polarized plug has two blades

with one wider than the other. A grounding type plug has two blades and a third grounding prong. The wide

blade or the third prong is provided for your safety. If the provided plug does not t into your outlet, consult

an electrician for replacement of the obsolete outlet.

11. Protect the power cord from being walked on or pinched particularly at plugs, convenience receptacles, and

the point where they exit from the apparatus.

12. Only use attachments/accessories specied by the manufacturer.

13. Unplug this apparatus during lightning storms or when unused for long periods of time.

14. Refer all servicing to qualied service personnel. Servicing is required when the apparatus has been

damaged in any way, such as power-supply cord or plug is damaged, liquid has been spilled or objects

have fallen into the apparatus, the apparatus has been exposed to rain or moisture, does not operate

normally, or has been dropped.

15. This product contains a lithium battery that is not user replaceable. The battery may be replaced by

qualied service personnel only.

DANGER OF EXPLOSION IF BATTERY IS INCORRECTLY REPLACED.

REPLACE ONLY WITH THE SAME OR EQUIVALENT TYPE.

Qt 300/600 Introduction

This manual discusses the installation of a sound masking system using either the Qt 300 or the Qt 600. The

Qt 300 and Qt 600 controllers have identical functionality, but dierent number of zones supported - the Qt

300 supports 3 zones whereas the Qt 600 supports 6 zones. As you use this guide, remember the number of

zones and total area of coverage is the only real functional dierence between the systems. Collectively, the

systems are referred to as ‘QtPro’ throughout this guide.

The Qt 600 supports six zones of sound masking, each with 1 to 120 Standard Emitters covering 100 to 12,000

square feet (9.3²) - 1,115²) per zone. The Qt 300 supports three zones of sound masking, each with 1 to 120

Standard Emitters, covering up to 12,000 square feet per zone (1,115²).

Sound Masking Emitter Types

There are two dierent sound masking emitter choices for consideration, both are direct eld devices meaning

that they are mounted downward for direct unimpeded transfer of an audio signal to the listening location.

Qt Standard Emitter – Is a passive audio loudspeaker device suitable for sound masking and limited output

level paging applications. This emitter receives an amplied signal directly from the QtPro control processor via

a UTP category cabling infrastructure. Maximum sound pressure levels with this type of emitter are 55 dBA at 1

meter with a sound masking frequency response of 200Hz to 6.3kHz.

Qt Active Emitter – Is an active (self-powered) audio loudspeaker device suitable for sound masking as well

as paging/ background music environments. This emitter contains an internal amplier which receives the

audio signal directly from the QtPro control processor in addition to a direct current voltage which powers the

Qt Active Emitter device. Both power supply(s) and voltage injectors are required for operation in addition to

the QtPro control processor. Maximum sound pressure levels with this type of emitter are 74 dBA @ 1 meter

with a sound masking frequency response of 125Hz to 8 kHz.

Each system comes with two audio inputs which can be used for paging and/or music. Additional controls for

each zone include time-of-day masking, auto ramping, self-monitoring fault detection and notication, and

independent equalizers for masking and audio inputs. The system may be operated from its control module

front panel or by a computer directly connected to the module or by a computer connected through a local

area network. See system conguration on page 15.

It is important that the control module’s masking volumes be set correctly for each zone to obtain the full

eectiveness of the system. If volumes are set too low, speech privacy will be reduced and work place

distractions will be much more apparent. If volumes are set too high, the masking sound itself could become a

source of distraction. The higher the setting that can be used comfortably, the better the acoustic privacy. For a

given open oce design, including ceiling height, ceiling material and workstation panel height, we can dene

the masking volume required to achieve “normal acoustic privacy,” i.e., when it is relatively easy to ignore

surrounding conversations. For a very large range of open oce designs, the target level is in the 45–48 dBA

range, measured 3 ft (0.9 m) above oor level. Similarly, for private oces, based on wall panel design and

ceiling construction, we can dene masking volumes required to achieve “condential privacy,”

i.e., conversations in adjacent oces cannot be understood. Most private oces have a target level in the

38–42 dBA range, averaged spatially within the oce.

Setting the masking volumes can be approached in one of two ways:

BEST: If a sound level meter is available, it is recommended that the control module’s masking volumes be

adjusted up or down to achieve the following readings on the meter:

• Private Oce Zones: 38-42 dBA, averaged spatially within the oce

• Open Area Zones: 45-48 dBA, measured 3 ft (0.9 m) above oor level

OTHERWISE: If a sound level meter is not available, the above levels are likely to be achieved in most

environments by setting the control module’s masking volumes as follows:

• Private Oce Zones: 05-09, for all ceiling heights

• Open Area Zones:

• 11-14, for 8 ft (2.4 m) ceilings

• 13-16, for 10 ft (3 m) ceilings

• 15-18, for 12 ft (3.7 m) ceilings

Masking volumes must be set suciently high to improve speech privacy and reduce distraction but not so high

that the masking sound becomes objectionable. Settings within the above ranges should accommodate both

objectives. As a general rule, use the high end of the range. Base nal settings on site conditions and customer

preferences. If people object to the sound level, set masking volumes toward the bottom of the range or refer

to the ‘Ramping’ section of this guide, found on page 22 for more information on introducing masking into the

space gradually. Remember that the eectiveness of the system relies on sucient masking sound level and

that initial objections are often overcome as people become accustomed to the sound.

Dierent day and a night volumes may be set. The control module ramps linearly between these two settings

beginning at the time specied and over the period of time specied. As the control module ramps between

settings, the current volume is displayed under “Current.”

NOTE: This document uses the QtPro software version 6.6.0 or higher for feature conguration.

Hardware Installation

Installing the Control Module

NOTE: Always plug/unplug power supply at wall outlet.

NOTE: The Qt 600 is shown in the gures, but the Qt 300 installs in the same manner.

Wall Mount

Mount the bracket using the three screws and plastic anchors (mollies) provided. Use a 1/4 inch drill bit for the

anchor hole. See Figure 1.

Plastic anchors are #10-12 x 1 1/4 in with #10 x 1 1/2 screws.

NOTE: The control module hinges forward for wall mounting and cable installation. To hinge forward, loosen

screws A and B (see Figure 1) used to secure the module during shipping.

Check to see that the panel lock switch is in the UNLOCKED position.

Rack Mount

Attach optional rack mount brackets to each end of the control module.

NOTE: When rack mounted, the control module does not hinge forward.

Step 1

Remove the QtPro and power supply bracket from wall mount

bracket.

Step 2

Reassemble power supply to right rack mount bracket using 6-32

black screws (included with bracket).

Step 3

Fasten left and right rack mount brackets to QtPro using the screws

removed in Step 1.

Step 4

Mount QtPro to 19” cabinet rail using 10-32 screws as shown

(included with bracket).

Installing the Qt Emitters

Important Considerations:

• Each run has a maximum of 60 Standard Emitters or

• 50 Active Emitters

• Each run should have a maximum length of 1000 ft (305 m).

• Each home run cable attached to the control module should be

labeled by zone # and run #. Adding a logical name (e.g. Mar-

keting, Private Oces) is suggested. In addition, ll out “Home

Run Zone Destination Record” at the end of this Guide.

• Each zone has two identical outputs, run 1 and run 2. All emit-

ters on run 1 and run 2 are controlled equally for each zone. All

emitters per zone must be the same type (Standard or Active).

• Each job-made cable should be manufactured according to

ANSI/TIA/EIA Standard 568-B. See custom cabling guidelines

on page 14.

• Job-made cables should be tested with a LAN tester before installation. Adjustable emitters should be set

for lower sound levels, within a zone, when sound level measurements show an acoustically loud subsec-

tion.

Standard Emitter Installation

1. Set the masking output level of all Standard Emitter zones to level 20.

2. Refer to the emitter layout and wiring diagram provided by the dealer for cable run connections by zone.

3. Run home run cables from control module to the location of the rst emitter for all runs in all zones.

4. Gather all ceiling tiles (per layout drawing) that are to receive emitters. Use the supplied hole saw to cut

holes in designated tiles. Cut all tiles from the front. (Dierent types of emitter housings are available to

attach in areas where there are no suspended ceiling tiles.)

5. Push the emitter through the front of the hole in tile and secure it by pushing down and twisting the locking

ring at the back of the emitter.

6. Connect a run cable from the specied zone OUTPUT jack on the module to the INPUT jack of the rst

emitter. Listen to each emitter as it is connected. If you cannot hear its “whooshing” sound:

• Try a dierent emitter.

• Test all four previous cables for continuity and shorts. Repair any faulty cables.

• If there is a short, circuit protection will engage, and masking volume will shut o. Once the short is xed, the protection

state should clear itself in approximately ve minutes.

7. Connect the next OUTPUT cable to the emitter OUTPUT jack.

8. Run the cable to next designated tile specied on emitter layout and wiring diagram. Tie cables up to

structure or suspend from deck as required by local building code.

9. On the next emitter, connect this cable to the INPUT jack.

10. Repeat Steps 4 through 9 for the remaining emitters on the home run.

11. Set sound masking volume levels for each zone, using either the front panel controls or the software

interface. Set sound levels according to Table 1.

12. If a small area within a zone exhibits a perceived volume louder than the rest of the zone, due to a

dierence in acoustics, use the adjustable rocker switch on the back of each related emitter to turn the

volume down (by 3, 6, or 9 dB from the value set at the controller). See emitter spec sheet for more details.

Be sure to x any problems and hear the “whooshing” sound before installing the next emitter. If necessary see

the Error Codes section of this guide, found on page 32.

Active Emitter Installation

Before masking output volume can be set for zones with Active emitters, the emitter Type and Masking

Spectrum for those zones must to be congured within the MCS software. Refer to the MCS Operations

section later in this document.

NOTE:

• The input jack of each emitter bears this symbol and is located near the safety tie o.

• The output jack of each emitter bears this symbol.

NOTE:

• The “tombstone” hook on the back of each emitter is next to the INPUT jack.

• This can help you nd the INPUT jack by touch.

• To adjust for unexpected obstacles such as sprinkler heads, each emitter maybe moved up

to 2 ft. (one tile or 0.6 m) in any direction.

Table 1

Zone Type Ceiling Height Vol. Level Intended Result

(at listener ear level)

Open Oce Areas < 9’ (2.75m) 11-14 45-48 dBA

Open Oce Areas 9’-10’ (2.75-3m) 12-15 45-48 dBA

Open Oce Areas 10’-11’ (3.0-3.3m) 13-16 45-48 dBA

Open Oce Areas 11’-12’ (3.3-3.6m) 14-17 45-48 dBA

Open Oce Areas >12’ (3.6m) 15-18 45-48 dBA

Private Oce Areas ALL 4-8 38-42 dBA

Installing Paging or Music to the Audio Inputs

1. Be sure power is OFF by unplugging power cord from wall outlet.

2. To install balanced audio input (most often, but not always characteristic of paging systems): Connect

signal wires to + and - at input A or B. Connect the shield to GND at the audio source.

3. To install unbalanced audio input (typical of music systems):

• Mono Signals: Connect signal wire to both L and R at input A or B. Connect the ground wire to GND.

• Stereo Signals: Connect signal wires to L and R at input A or B. Connect the ground wire to GND.

4. If a music source is to be connected, using Input B allows emergency music shut-o. See Installing Contact

Closures below.

Installing Contact Closures

The QtPro provides an instant shut-o capability for masking and/ or audio Input B if connected to a contact

closure interface. The contact closure utilizes the same style connector as audio Inputs A and B (4-pin).

To leverage this feature for masking, connect a two-conductor cable to the two connectors, labeled M3V

and MGND. To leverage this feature for Audio Input B, connect a two-conductor cable to the two connectors,

labeled B3V and BGND.

The other end of these conductors (treated as pairs/circuits) can be terminated on closure mechanisms of your

choice:

1. To shut o masking, form a connection between the two “M” conductors.

2. To resume masking, break the connection. (Don’t break the connectors as you may want to reuse them.)

The contact closure for audio Input B follows the same logic.

Custom Cabling Guidelines

Important Considerations

1. Use solid conductor 24 AWG CAT-3 cable that meets local code requirements.

2. If the system is installed in a return air plenum, the cable must be plenum rated.

3. Shielding is not required. Unshielded twisted pair (UTP) cable is acceptable.

4. Snagless boots are not required.

5. RJ-45 plugs must use the “bent 3-tine” RJ-45 plugs intended for use with solid core CAT wire. Three-

tine plugs can be purchased at a hardware store and from most CAT cable suppliers. DO NOT USE

the “aligned two-tine” type intended for stranded wire, as they provide improper contact and may yield

intermittent system operation. The diagram below shows the cross section view of both types.

6. Field test each cable after fabrication with the RJ-45 connectors (before nal installation), using a standard

network LAN cable tester, to check for continuity, shorts, and 1:1 (straight through) connection.

Battery Replacement

A coin-style battery (Cr1220 or Br1220) powers the real time

clock during a power loss.

To replace the battery:

1. Unplug the control module from wall outlet.

2. Hinge the control module forward to access the connection

panel.

3. Remove the zone run connections. They should already be

labeled, if not, label before removing (for example: Zone 1

Run 2).

4. Remove the six screws that hold the panel.

5. Taking care not to disturb the other connections, lift the

panel to expose the coin battery in its housing at the front left of the module. See Figure 3.

CORRECT

RJ-45 Connector with bent type

INCORRECT

RJ-45 Connector with aligned type

6. Use a ball-point pen to dislodge the existing battery.

7. Insert a new battery with the positive (+) side facing upward.

8. Replace the connection panel, securing all six screws.

9. Reconnect the zone run cables.

System Conguration

After the QtPro is mounted, the power can be turned on and settings modied to test wiring to the connected

emitters. After testing, it is time to congure the controller for operations. There are two methods for performing

conguration:

1. The front panel display can be used for basic conguration settings to get the system working and tested.

In many cases, basic settings are all that a user needs. This interface only supports a subset of the

functionality.

2. The MCS (Monitor Control Software) interface allows for conguring all the available functionality. The MCS

can be used with any internet browser that can connect to the Qt 300/600 over a LAN connection. See

System Control Using MCS on page 20 for details.

System Congurable Feature List (Front Panel / MCS)

The following is a complete list of the Qt 300/600 features and if they can be congured through the front

panel, MCS, or both:

Feature Front Panel MCS

Set masking level for each zone independently X X

Setting audio input levels at each zone X X

Setting real-time clock or network clock use X

Reset system to default settings X

Congure netowrk name and IP address X

Set Time of Day Masking X

Set Auto Ramping Period X

Set Masking Equalization X

Viewing errors X X

Conguring error notication X

System/Software version information X X

Emitter Fault Detection X X

Networking and Security Administration X

Software Update X

Contact Closure (hardware only)

Lock/Unlock the front panel (hardware only)

Conguring the Control Module for the Network

IP Address DHCP

The IP address is preset for systems that are not on the network. To directly connect to the control module over

Ethernet, use any internet browser and placee the IP address or control module name in the navigation bar.

If the MCS is not used, DHCP will allocate an IP address when the system is connected to the network.

This eld can be statically set through the MCS, but it will be dynamically allocated when MCS is not used.

NETBIOS Support

The system supports NETBIOS and advertises its Hostname as QtXX, where XX is the last two digits of the

MAC address.

Other Recommended Connections

Access to an SMTP server enables the sending of error notication emails.

Access to an SNTP server obtains the SNTP time stamp. If the SNTP server is enabled, the real-time clock

feature is disabled. A time server other than the default time server may be specied in the Administration

section under date and time.

Suggestions for Managing Multiple Control Modules

Browser bookmarks are a convenient tool for managing multiple control modules. A bookmark add-on stores

bookmarks on a web server and allows access from any computer on the LAN.

Create a “Sound Masking” folder (under Bookmarks) to hold a bookmark for each control module.

Use location-based names for each module’s bookmark. To access a specic control module, open

Bookmarks>SoundMasking, and select the specic module bookmark.

Front Panel Control

The front panel is used for conguring basic functionality and initial system test. For advanced system

conguration, the MCS is required. Once the MCS is used to congure the system, it should be used

exclusively. Otherwise, using the front panel will erase the settings congured by the MCS.

System Information

Initial display of the front panel, shown below, shows the software version and system status.

The VERSION X.X.X indicates the following elds: major release; minor changes; bug xes. The HxBx format

is to identify the version of the internal code and, on rare occasions, used as reference for technical support.

Status indicates if there are errors (see Error Codes and Clear Error on page 32) or if the system is OK.

The MAC address is displayed for reference when the system is on the network. The network administrator will

need this when conguring a network connection.

VERSION X.X.X

Status: OK HxBx

Shown in the next block is the display for the IP Address. This is a default value that can be used in a browser,

for direct connection. As noted, DHCP will change it when the system is on a network.

The Host Name is set at the factory to a default value.

The next 2 blocks show the username and password when connecting using MCS. The default username is

admin. The default password is secret.

A warning message is displayed on the front panel after the MCS is used for conguration (Warning: Time of

day Ops). This tells anyone about to use the front panel that the MCS has been used for conguration which

means that using the front panel will reset the settings made by the MCS.

Setting Sound Masking Levels

The format of this front panel shows one type of format for conguring masking. The zone emitter type is set to

AE (Active Emitter). Z1 stands for zone 1 and it is currently set to mute.

The zone emitter type for zone 2 is set to Qt Standard Emitter.

See the Introduction section on pages 8-9 for recommended volume settings.

Settings within the recommended ranges should optimize speech privacy without excessive distractions.

Generally, set masking volumes toward the high end of the range and adjust according to site conditions and

user preferences. If possible, measure the results with a sound level meter and check for the achieved sound

pressure level. Adjust as necessary or judge by listening in the area.

IP AddressDHCP

169.254.1.1

Host Name

QT XX

Username admin

Password secret

Masking Ot AE

Z1 Volume: Mute

Masking Ot

Z2 Volume: 2.5

If installation occurs before the oce is occupied, turn the system to the desired level and leave it at that

level. If the system is installed after the oce is occupied, turn the system to the correct level when the

space is unoccupied and employ auto ramping, only supported through the MCS, to provide for a period of

acclimatization.

To set the masking level for a zone, use the arrow keys on the front panel to move to the right until the zone

of interest is shown (Z1 is zone 1 which matches the rst column of ports on the back). Then use the up and

down arrows to change the value.

After setting the value for one zone, arrow to the right or left to set the value for the next zone of interest.

Repeat for all zones. If a small area within a zone exhibits a perceived volume louder than the rest of the zone,

due to a dierence in acoustics, use the adjustable rocker switch on the back of each related emitter to turn the

volume down (by 3, 6, or 9 dB from the value set at the controller). See emitter spec sheet for more details.

Important

• Prior to setting volume, set the correct emitter type. For zones with Active Emitters the emitter type must be

set to Qt AE.

• For full system eectiveness, it is essential to set the volumes correctly for each zone.

• If the volume is set too low, speech privacy is reduced and workplace distractions are more apparent.

• If too high, the masking sound can become a distraction. Since, in general, acoustic privacy improves as

sound masking volume increases, the general strategy is to set the masking volumes as high as possible

without being distracting.

• Volume changes made via the front panel will override and pause any Auto Ramping or Time Of Day

scheduling congured through MCS. To restart these schedules login via MCS and re-apply these settings.

Setting Audio Input Levels

This gure shows the format of the panel for conguring the volume for Input A (also used to congured Input

B). The level of the input is set for each zone, where the example shows Input A is level 6 for zone 1 with

standard emitters.

The system has two inputs for paging or music. Either input may be connected to any or all zones via software

or front panel interface. If no paging and/or music from these inputs are desired in a particular zone, set the

audio volume level of that zone to mute.

Note that Input B is the preferred music input due to its ability to be shut down via a contact closure.

The audio input levels are set in a similar way as the masking. Use the arrows on the front panel to move left

and right to nd the Input A and Input B eld for each zone. The inputs are enabled and level set for each zone

for exibility. Arrow to each zone for each input and set the level using the up and down arrows.

Input A Ot

Z1 Volume: 6

Lock/Unlock the Front Panel

The settings of the Qt 600/Qt 300 can be locked by a physical switch on the back of the control module.

Lock the control module panel by moving the lock switch to the LOCKED position. This prevents any casual

interaction from changing the settings.

Unlock the Front Panel and Control the System

1. Loosen screws and lift the control module slightly and hinge it forward to give access to its connection

panel.

2. Move the panel lock switch to the UNLOCKED position. Close the module.

3. Press NEXT or PREVIOUS to scroll between screens for adjusting sound masking, paging or music

volumes by zone.

4. Modify a value by 1 dB on any screen by pressing + or -.

5. Press NEXT to accept a screen value.

6. After completing adjustments, lock the system.

NOTE: The system returns to the initial VERSION/Status screen after ve minutes of inactivity. Z1 indicates

Zone 1, Z2 indicates Zone 2, etc.. If an error is detected, an error code is displayed on the control module. See

page 35 for details about Error Codes.

Congure Network Name and IP Address

Creating a static IP address or controller name is not available from the front panel. The MCS software

can congure both the network name and the IP address (see below). If the system is not connected to the

network, the initial values shown on the front panel are used when connecting a PC to the QtPro over Ethernet.

If the QtPro is connected to the network, a DHCP server will dynamically allocate an IP address. The system

MAC address is used by the network system administrator to congure the DHCP server.

NOTE: When connecting a PC directly to the control module, the control module acts as a DHCP server and

serves the DHCP-enabled PC and IP address.

Real-Time Clock or Network Clock

When the QtPro is congured in the factory, the date and time is set to Jan 1. Basic operations will work

without changing this time. For any advanced features that require the time of day, either the network clock or

correct setting of the time is required.

If the QtPro is not connected to the network, it will use a real-time clock within the controller. This requires the

battery for power. This is often the way time is supplied to the QtPro.

If the QtPro is on the network, time and date will be acquired via SNTP and saved to the real-time clock. If the

QtPro is o the network, time and date are acquired from the onboard real-time clock.

Reset System to Default Settings

To clear an error indication (after problem is xed) or reset the settings to the initial default state, the system

should go through a hard reboot.

Steps for the hard reboot:

1. Unplug the power and wait 15 seconds or more.

2. Hold the up arrow on the front panel and re-connect power. Release the up arrow once the LCD display

shows it is booting.

System Control Using Monitor Control Software (MCS)

The MCS (Monitor Control Software) is an interface that congures the QtPro over a LAN/network connection.

The MCS software is operated from any network browser, see page 20. Below are the instructions to connect

to the control module over Ethernet locally and over the network.

After the discussion on connecting to the control module, the MCS screens will be discussed.

1. Read the control module’s Host Name or IP Address from the front control panel.

2. Enter either the Host Name or the IP Address into the browser address bar.

3. A prompt will appear requiring a username and password. (The default username is “admin”. The

default password is “secret”.)

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CAMBRIDGE Qt 300 Installation guide

Brand: CAMBRIDGE

Model: Qt 300

Type: Installation guide

This manual is also suitable for

Qt 600

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CAMBRIDGE Qt 300 Installation guide

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CAMBRIDGE Qt 300 Installation guide

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